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Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]        
Non-deductible reserves and accruals $ 8,189 $ 9,795    
Net operating loss and other carryforwards 7,560 7,862    
Stock compensation 5,327 5,900    
Depreciation and amortization 1,196 813    
Other assets 50 490    
Gross deferred tax asset 22,322 24,860    
Less - valuation allowance (2,193) (1,534) $ (1,565) $ (2,200)
Sub-total 20,129 23,326    
Depreciation and amortization (453)      
Goodwill amortization (5,013) (5,097)    
Deferred commissions (4,928) (5,344)    
Net deferred tax asset $ 9,735 $ 12,885